High or low water alarm for boilers.



Nu. 654,63l.v Patented luly'sl, |900. E. n. HAYs.- HIGH 0R LOW WATERALARM FOR BOILEBS.

(Application med mc. 15,1899.) (No Modal.)

FIG. 1. FIG.

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Harman STATES PATENT Ormes.,

EGENE D. HAYS, `OF,PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, OF 'IWO-THIRDS TO JOHN W. GRIFFENBERG, FRED. DE'VITFGOO-DVIN, ANDNVILLIAM O.VHAYS,

von SAME PLAGE.

HIGH OR LowwATER ALARM Foa sodass.

SPECIFICATION forming part of Letters Patent No. 654,631, dated July 31,1900.

` Application filed December 15, 1899. Serial No. 740,461. (No model.)

in high and low water alarms for boilers or One object of the saidinvention is to con-k structawater-gage for boilers ortanks in such amanner that an ala-rm will be given when the water rises or falls aboveor below certain given points, a further object being to avoid thecomplicated mechanical construction usually used in such devices, whichare imprac.

tical and costly.

The invention ismore fully described here. inafter, reference being madeto the accompanying drawings, in which- Figure l is a perspective'viewof my invention applied to the ordinary water=colu1nn ofv asteam-boiler. Fig. 2 is a vertical sectional view; and Fig. 3 is across-sectional view on line 3 3, Fig. 2.

Referring to the drawings, A represents a water-column of asteam-boiler, with which connection is made with the gage or alarm at Band C, each connection being provided with valves B and O', said valveshaving couplings b and c, and between said couplings is interposed aglass column D.

The device so far as above described corresponds with the ordinarywater-glass of steam-boilers. The connections B and C be# ing open, theywater will appear in the glass at a level corresponding to that in theboiler.

The valve C is provided with a coupling c', by which is secured to thesaid valve a glass tube E. Said tube is curved, and its opposite endsecured to a stop-cock F, from which connection is made with the boilerby means of the tube G, the elbow g, the pipe g, and the valve B. rllhecurved tube E is provided with electrical termini H, H', and H2, eachhaving a contact-point h projecting vtrical terminal.

between thetermiual H, with which the mercury is always in contact, andthe terminal H', thereby ringing a bell. When the water in the boilerand in the column D rises, the

additional Weight of water will depress the l mercury and break the'circuit between termini H and H2; and if the water rises beyond a pointj, Fig. l, the mercury will be forced around the curved portion of thetube E'until it reaches the terminal H', when connection will be madewith the terminal H and an alarm given.

Fig. 3 shows the construction ot' the elec- A binding-post is secured toa band e, which encircles the glass tube E, the said band havingprojections e', between which is clamped the platinum contact-point,which is embedded inside of the glass tube and extends-through thecenter of the same.

The stop-cock F is used for drawing oft the water that may collect fromthe condensation of the steam in the column G. Normally the stop-cock isturned, so that there will .be a free passage between the mercury andthe boiler, thus allowing the steam-pressure to act equally on thesurface of the mercury and the surface of the water; butwhen used fordrawing off the water the stop-cock is arranged so as to prevent themercury from being forced into the tube G or carried off with theescaping water.

In place of ringing a bell it may be desirable to operate a pump orinjector by starting or stopping the same with the electrical current,any of which devices may readily be operated by my invention.

The tube D between the valves B' and C could be omitted, as the weightof the water in the boiler would still have the same effect on themercury, and the stop-cock F could likewise be omitted when the deviceis used on tanks Where provision does not have to be made for thecondensation of steam.

Having thus described my invention, I claim and desire to secure byLetters Patentl. The combination, in a high and low Water alarm forboilers er tanks, of a vertical tube or gage-glass, a vertical tubeextending parallel With said gage-glass and connected therewith at thetop and bottom, a dependent curved connection having,` electricaltermini inserted therein, electrical contacts, mercury in said curvedconnection to complete or break an electrical circuit between saidJtermini thereby giving an alarm, and a stop-cock F having couplingsthereon to receive the tubes, substantially as described.

2. The combination, in a high and ioW Wa* ter alarm for boilers ortanks, ot' a vertical tube D, a tube G, a dependent curved tube having,`electrical termini inserted therein, mercury in said curved tube tocomplete or break an electrical circuit, electrical contacts,binding-posts provided with bands 'for attaehing` the same, anelectrical terminal ll continuously in contact with the mercury, terminiIl' and H2 arranged so that the mercury may come in contact with eitherand complete an electrical circuit, a suitable electrical device forgiving` an alarm, a stop-cock F, fittings thereon to receive the tubesand iittings c and c on the valve @substantially as described.

n testimony whereof l have affixed my signature in presence of twoWitnesses.

E UGENE l). HAYS.

Witnesses:

JOHN E. MCCULLY, THOMAS G. Hluvnns.

